i've a NAS with 5 disks in RAID-5.
I used it as DataStore for Virtual Box Hard Disk. So i've for example one big (1.5 terabyte) VDI file that contain 200k files.
I'm wondering: Is the single file good managed by physical Raid or, for example, my Nas is 'stupid' and save this single file into... a single disk and not 'straied' onto all disks ?
Thanks

Yes, Even big files are made up of seperate blocks depending on the volume block size (512b/1k/4k etc.) those blocks are spread over the disks trough the Raid rules as in posted link.
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FlashJun 4 '12 at 13:43